私下里说，我不确定这没有超出他们的理解。

Confidentially, I am not sure that it wasn't above their heads.

《柯林斯英汉双解大词典》

如果没有他在身边，我不确定自己是否能完成这篇关于坎特伯雷故事集的毕业论文。

Without him around, I am not sure how I could do a senior thesis on The Canterbury Tales books.

youdao

我也不确定他到底意识到了没有。

I'm not sure if he has really sunk in.

youdao

You always want to check your signs at the and because it's so easy to get the sign wrong, and I was hoping that it was right here because I wasn't sure, but it turned out to be right.

我们完成计算时，一定要记得检查符号,因为很容易弄错符号，刚才我就不太确定,是否弄错了符号，检查发现没有问题。

麻省理工公开课 - 热力学与动力学课程节选

What extent was the primitive form of Primitive form of what I'm not sure that that concept makes-- No, the answer is no, because nobody was compelled to do anything.

原始形态的比重,什么的原始形态,我不确定那个概念,不,因为没有人被强迫做任何事

耶鲁公开课 - 古希腊历史简介课程节选